>>29715858Stealth Rock, Screens, gyro ball. Light clay/Leftovers. Defensive EVs, low speed IV.
>>29715921If you wanna use mega.
Waterfall, Ice Punch, EQ, Rain Dance/Superpower. Either have some other mon set up rain or have swampert do it the turn it mega evolves. Adament, EVs go into attack and speed/HP.
If regular swampert, leftovers, HP and defense EVs, stealth rock, waterfall, EQ, protect.
>>29716207Harvest, Chesto Berry & rest, or just sitrus berry, Horn leech, Leech seed, will-o-wisp, substitute, shadow claw. IVs go into HP and attack.
Alternatively give it Natural Cure, leftovers/Big root. Attacks and IVs are same as above.
>>29716219Don't use it.