$250,000 BUDGET - WHAT'S POSSIBLE?

Can't comment on much else, but if you're going for a 3D pre-rendered stuff, I don't think it'd be too difficult.

Blender 3D artists are notorious for being kind of shit but there's no shortage of tutorials for nature or Medieval scenes. Even if you didn't want to do it yourself, it really shouldn't be too hard to find someone who can make you stuff like this:

Other than OMORI, I don't think I've ever heard of an RPG Maker game that had a 6-figure budget. Most games with that kind of spending power use more advanced engines. Many of us on this site are hobbyists with small budgets, or oftentimes none at all, so it's kind of hard for me to wrap my head around this level of ambition.

I can't really offer much in the way of financial or business advice, but I imagine if you have a quarter million to spend, you're likely looking for a much bigger return than that. I will be honest and say that will be very difficult to achieve in today's RPG Maker scene and unless you can find a level of success like the aforementioned OMORI, you might want to consider looking for a game using a more advanced engine.

i only accept monopoly money

Marrend
I am honesty not sure if one year of development time is sufficient to make a 10-15 hour game.

Gonna hard disagree with this. There are several people on this site that routinely make four to six-hour games in less than a month that are relatively well received. Honestly, 15 hours in a year seems really easy to me, especially if I've got a team behind me and all I have to do is make the game and not have to worry about scripting, music, and graphics. And that's the thing about $250,000; it's no longer a hobby, at that point. It's a job. Upfront payment followed by a weekly or monthly salary and a final payment on delivery of product.

On the one hand, I agree that if you've got a six-figure budget, a more advanced engine is usually what most people will go with, but if you want something that looks like Chrono Trigger, RPG Maker will definitely do you. RPG Maker's limitations, while a lot harder than more advanced engines, can still be completely broken. I mean, completely. For example, Kazesui makes true 3D environments in RM2K/3. So, even though it wouldn't necessarily be my first recommendation with that kind of budget, I still see nothing wrong with using an RPG Maker for this.

Personally, for a team, I'd recommend a dedicated developer (scripting and eventing), a writer, a graphic artist (I recommend having this person additionally do the in-engine mapping instead of leaving that to the developer), and a musician.

Overall, though, if you're looking for either a team or a dead project to resurrect, you're in the right place. I'll personally throw my hat in the ring for the writer slot. I'm currently writing Nihilo (chapter 1 was written by NTC3. I'm writing everything onward. The demo goes to the end of chapter 2, so you can see my writing there. I've also got several other games that I feel showcase my writing well. My best examples are A Most Inconvenient Evening, Age of Myth, Decline, Mechanima, The Alchemist and the Owl, and Vega Legacy.). Nihilo is made in RM2K3 and that's so system broke, you can't even tell, so yeah, any RPG Maker will serve you for a top-down old-school RPG.

Ideally... realistically.... it's impossible to math it out. I would not use simple game jam games from solo devs using off the shelf assets as a measuring stick for larger complete games, they're just fundamentally different. Things can multiply or get out of hand with bad management or multiple people, or if the project is vaguely ambitious enough that you can't lay it out in JIRA tickets. The OP is extremely vague about whether they want straight up Chrono Trigger (combat and all) or a really basic 5/10 Dragon Quest clone with Chrono Trigger graphics (or whatever's referenced).

The problem is generally lining up production so that the level designers/map makers can make the content by the time art is shuffled in, and you aren't constantly sending back revisions and changing things. Depending on how easily satisfied you are and aren't asking for the world. By Chrono Trigger you mean the battle system? Because someone's likely have to script that (or find an existing plugin) and that will push back the content creation back more. Mappers will also need to talk to whoever is designing the battles, or be the same person. If anyone has to work with each other directly, that creates a huge question mark in how efficiently content can be made.

The content would have to be very town->dungeon->boss->town and made like kraft dinner over and over to be easy to estimate. I'm assuming there's no fishing mini game, no potion/crafting system no weird attention to detail bullshit, no giant dragon setting a town on fire crazy setpiece or anything super animated that can't be done with charsets hopping around and bumping into each other. Each additional thing you add is going to require more complexity or at least cooperation between team members of how best to put it together. Without those things I'd say 250k is likely overbudget unless the game is going nowhere and you need to keep people employed to keep making stuff because you can't make up your mind on what you want from day 1.

tldr: I'd be very specific about what you want for any estimate from any of us to be helpful. Money can't solve bad direction or management.

That's a very interesting topic that hasn't been discussed often here.

Going for a crypto game when your target audience is a small community that you're already a part of seems like an odd choice to me: You mention that you're not looking to make any return on your investment, yet crypto games' main objective is to attract and keep a large number of players. Most of your budget would normally be spent on promotion, advertising the game to attract new players.
If that's not the case, what's in it for you?

By the way, just to be sure, do you plan on paying your development team with cryptocurrency or real money?

The kind of game you're looking for is certainly possible to make within a year and within that budget, as long as you hire experienced and trustworthy people and pay them a decent salary, preferably once a week.
But I have to mention that Chrono Trigger features 16-bit pixel art, and the reference videos you've shared feature 32-bit pixel art enhanced using photo editing software. There's a huge difference between the two styles, and that will be reflected on production time and costs.

It would be helpful to know more about what kind of project you have in mind.
Will you design the game yourself, writing all the production documents to guide your team?
Or would you prefer to hire a game designer that will handle all of that?
In that case, your next step might be to ask people to pitch their ideas and select your favorite. Or you could also play some of the games you can find here, identify your favorite game designers and make them a business proposition.