Hello, i just quickly made an account so that i may find a game that i played when i was younger. It was a 2D fighting game with mecha-esque characters. i believe these characters were customizable. the games that i remember were tag team with one other cpu player. i played this game on my game boy SP. if you pressed the "select" butten while in a fight you would use a maga/special/Ultra attack if you used the "Select" Butten while in the customize screen you would switch characters with your tag team friend. The maps were 2d but i believe they had different layers, kinda like in the supersmash games. Thanks for your help!