This might be controversial but I'd be more than willing to spend a few bucks on my bro if I get to customize the stats and whatnot

Idea:
>In game center like either a Pokemon Center or Pokemart, green or gold roof
>Different NPCs let you buy different things by "importing them" in-game from "overseas" or "a mystic land" if you purchase them with irl money
>One NPC sells rare items like Master Balls, Rare Candy bundles, TMs (maybe even expanding the TM count over 100 for this), rare berries, etc
>Another sells rare Pokemon that you get to select the nature, ability, shininess, ivs, and evs of, moves, etc, each costing just a tad more to specify, some custom secret moves/abilities available exclusively through this method
>Can buy the option to make a custom-painted Pokeball through some sort of Pokeball designer for your bro for just a buck or a few bucks
>Can buy a "wonder import", which randomly nets you a Pokemon - could be bad like a route 1 lv 2 or great like a legendary
>Can buy big bundles of regular items if you don't want to work for them in-game
>Can buy special clothing or other customizable items for your character
>Game constantly updates to reshuffle or expand purchasable items

Why would this be bad? It'd literally only be adding features into the game.

"Harr p2w"

If you don't want to buy anything you don't have to