I have a Slowking if you don't mind losing a pokemon, then I can trade it to you. If you have any of these pokemon below then i'll trade the Slowking for one of them:
Kabuto - Mewtwo - Mew - Chikorita - Bayleef
Meganium - Pineco - Forretress
Gligar - Shuckle - Stantler - Magby - Suicune
Entei - Raikou - Skitty - Minun - Gulpin
Swalot - Cradily - Milotic - Regirock - Regice
Registeel - Latias - Latios - Kyogre - Groudon
Rayquaza - Jirachi - Tangrowth - Magmortar
Glisgor - Mamoswine - Phione