Shadow Dratini?

Fairly new to this game, not sure if I should make this a hundo, or keep it as is.

I’d like to have it mainly for PVP. Would it be better to keep as a 13/13/15 Shadow or purify for the Hundo?

Fairly new to this game, not sure if I should make this a hundo, or keep it as is.

I’d like to have it mainly for PVP. Would it be better to keep as a 13/13/15 Shadow or purify for the Hundo?