When I said that sub. always goes first, I was reffering to Trick Room utilizing slow start and its poor speed stat to usually go first (so substitute should always goes first, added with its bulk and it should withstand one normally effective attack) I wasn't sure about White Herb but thanks.
I think I Regigigas like this can work best (On a Trick Room Team)
Reggigigas @ Sitruis Berry
Nature: Adamant/Brave
EV: 252 Def/252 Sp.Def/4 Hp
~ Substitute
~ Zen Headbutt/Headbutt
~ Confuse Ray
~ Rock Slide/Wide Guard
If combined with Trick Room, substitute should always go first (when you add slow starts effects) Being bulky (and ev'd to wall) it should stay stable (stalling the first round). Zen Headbutt is used for type coverage and provides a chance of flinch, which could stall your sub and slow start. Headbutt provides STAB and provides flinch, but walled by ghost (Chandulure/Gengar) Rock Slide is for coverage and flinch while wide guard works better if you predict your opponent and block an attack for that round. Od course confuse ray tops it off giveing you the slim chance of excaping an attack for that round
Well, please let me know what you guys think, thanks for telling me White Herb didn't work. Btw, Whismicott can use Trick Room and U-Turn, so it can be used in both singles and doubles using prankster to use worry seed and TR faster.
Hope This Helps