Suggested ability: Contrary
Suggested item: Oran berry/Evolite
Leaf Storm-Offers STAB; raises SP Atk thanks to ability, counters Poliwag
hidden power [Ground]-cover Magnemite, Chimchar, and Houndour.
twister-Has decent chance to flinch; deals with Dratini thanks to contrary boosting.
giga drain/ glare/ mean look/taunt-Giga Drain lets it recover health, but doesn't offer as much coverage due to you already having LS; Glare is there to cripple the opponent; Mean look traps the foe if needed, and taunt prevents them from setting up on you.
Other useful moves: Reflect, light screen, safeguard, swords dance+physical moves like pursuit, leech seed.