My favorite stat upper is stockpile up gastrodon.
Gastrodon @ leftovers
Sassy Nature
28 HP 230 def 252 sp. def
Toxic
Stockpile
Earthquake/surf/hidden power electric/ice beam
Recover
Get in on an electric type, thunderwave, or cressilia, and stockpile up.It can get in on standard rapid spin starmie too. If set up, it usually rips through an entire stall team. It owns any boltbeamer, especially calm mind bliss and cress. Then nail them with toxic, and start to stall. Then, attack when you have to. If you are walled, switch out after recovering. With Earthquake, levetating poisons and steels wall, with surf, toxicroak and poison types that resist water wall. Hidden power electric has the best coverage, but has low BP. WATCH OUT for shaymin, celebi, and grass types immune to toxic. It can take a few grass knots from most foes after 3 stockpiles because it is lightweight.
In UU, I seem to have more trouble switching in. Grass types are far more common here...
One could use the analisys spread, but mine has 368 HP, so... so does this one. This spread is slightly tougher overall, but has worse offense.