If Chansey truly is giving you troubles that much, you could try Psyshock instead of Psychic on your Alakazam, or consider Minimize/Stored Power Clefable, though Toxic users will still make things difficult unless you can evade a few of them.Hi folks!
I build this team recently
Alakazam
Ability: Magic Guard
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Psychic
- Substitute
- Encore
- Energy Ball
Aerodactyl
Ability: Pressure
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Stealth Rock
- Earthquake
- Stone Edge
- Taunt
Clefable
Ability: Unaware
EVs: 252 HP / 252 Def / 4 Spe
Bold Nature
IVs: 0 Atk
- Calm Mind
- Moonblast
- Thunder Wave
- Moonlight
Nidoking
Ability: Sheer Force
EVs: 148 Atk / 108 SpA / 252 Spe
Naive Nature
- Poison Jab
- Sucker Punch
- Earth Power
- Thunderbolt
Tentacruel
Ability: Liquid Ooze
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
- Haze
- Acid Spray
- Scald
- Rapid Spin
Zapdos
Ability: Pressure
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Thunderbolt
- Heat Wave
- Hidden Power [Ice]
- Roost
I'm quite happy with this team but I still have problems with Chansey and Golem
Any advices ? ^_^
For Golem, you do seem to have a lot of rock and ground vulnerability. Alakazam is again a good solution if you can get the switch in right, but you could also consider a more bulky Zapdos with HP:Water or Grass if Golem continues to give you fits. In a format with so few viable Pokemon, having specific solutions for particular Pokemon is more reasonable.