I don't know what Pokesho is, but the answer will vary either way.
If these are ripped sprites, you may use them.
If these sprites are made by "Pokesho" and not Nintendo or a second party (ie Game Freak), then no, you may not.
hey there... I was wondering, can I use PokeSho's sprites (face sprites) for my entry in the contest? with credit? (we can all use their sprites freely but with credit right?) if not please let me know