Right, i'll cut straight to the chase.
I need a 6th Pokemon for my Ruby team, but before anyone says anything there's a few things you need to bear in mind beforehand please:

(1) It's on Ruby and I have no access to Sapphire/cheat cartridge.
(2) No legendaries/semi-legendaries/Ubers please.
(3) I'd prefer it to be a happy fun Pokemon.
(4) Only R/S Pokemon.
(6) Please include moveset/items/nature and ability.
(5) It's fighting alongside:
Swampert <> Swellow <> Zangoose <> Absol <> Tropius

Thanks in advance people.