I am literally shocked you managed to do this on gbstudio...
And making a pokemon game where you have to sell your teams to upgrade the others is diabolical xD I really loved it though! The game has gorgeous sprites and a depth I wasn't expecting at all! I ended up getting really attached to my legendary Tanit, just like you level up only your first pokemon xDD Which made the moment I thought I mistakenly sold it heartwrenching!
Genuinely think the game has a crazy untapped potential! Only low was that I cheesed through the game without really understanding the fight system, and only spamming what was available. There seemed to be special abilities only for some coins that I didn't need to understand to win, so I feel like that's the kind of thing that could be developped on a larger game :D
Congrats on making it, hope you had fun!