I forget the name of a game

I played this game when I was a kid and now I am 15 but I really wanted to try the game again but I forgotten it. The game was "quite" similar to pokemon. Its about an adventure where you have a machine animal. I remembered myself having one machine sabre that has a dark cyan body and the head has a white blade on its head. I can remember one of a machine and it's called Viper. Game is on gameboy advance sp. Sorry if this is lame but i really want to play this game.

@ququroi

Hm. Was it a Dragon Warrior Monsters game? What you're describing sounds like Swordgon.

But these aren't machines, so probably not I guess...