Defensive Staller:

Item: Leftovers
Nature: Bold
EVs: 252 HP/ 152 Def/ 252 Speed
Moveset:
~Toxic
~Protect
~Substitute
~Swagger

Basically, you first set up a substitute, then you hit your opponent with a toxic, then use swagger so there is a lesser chance of it hitting you when your not using protect. The EV spread is set up so that the swagger's attack raising effect doesn't ruin Uxie in the long-run, as well as an added protection against attacks with a larger HP stat, and finally, a big speed stat so Uxie can quickly set up the toxic and substitute.