Greymon

Digimon Adventure
Greymon First Digivolves from Agumon in Episode 2 and later digivolves to Metal Greymon. He is Owned by Tai Kamiya

Digimon world
greymon digivolves from agumon,can further digivolve to metalgreymon.

Digimon world 2
greymon digivolves from agumon.

Digimon world 3
Greymon digivolves from Veemon and Guilmon  at level 20, but can digivolve to agumon by geting him in the power pack as a starter.

Digimon world ds
gryemon digivolves from agumon at level 15, asnd can digivolve to metalgreymon at level 25, but friendship is involved.

Digimon world dawn/dusk
Greymon digivolves from agumon, and can further digivolve to metalgreymon.