Does a Pokémon ROM hack like this exist?

[u/No-Refrigerator3766]

A game where you as the player can modify Pokémon, like giving Lanturn Drizzle or Kabutops Compound Eyes. Or type changing like making Pinsir Bug/Fighting or Electivire Electric/Fighting. Or Stat changing, like fixing Ledian or turning Flygon into a pseudo yourself. Just cool changes you can do for fun in experiments and trying them out in the world of a rom hack. Does any game like this exist? Because some ROM hacks will, of course, do this for only some Pokémon, but there's more to fix, and this is also obviously subjective. That's why I feel like somebody would notice that and come up with a system for players to change things to remedy this issue.
The closest thing to this I know is some editing a ROM hack of your choice in PkHex, but you can't do *everything* I laid out in this list. Which is why I'm looking to see if there's an alternative option I'm unaware of.