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Nintendo 64 - Transformers: Beast Wars Transmetals 64 cheats

Unlock Blackarachnia
Choose arcade or VS mode. Go to the character slection menu, 
highlight Tarantulas, then hold Z and hit A. Push Right or Left 
to go through his colors to get access to Blackarachnia.

Unlock Starscream
Choose arcade or VS mode. Go to the character slection menu, 
highlight Waspinator, then hold Z and hit A. Push Right or Left 
to go through his colors to get access to Starscream.

Unlock Ravage and Tigatron
Choose arcade or VS mode. Go to the character slection menu, 
highlight Cheetor, then hold Z and hit A. Push Right or Left 
to go through his colors to get access to Ravage and Tigatron.

Unlock Megatron X as playable character:
Beat Megatron X in arcade mode without using a single continues

Megatron X as opponent:
Finish the entire game with Megatron with no time limit.
Defeat Megatron X at the end.

Rattrap's armor
Finish the entire game and defeat Megatron X