Ask and you shall receive
Tangrowth @ Assault Vest
Ability: Regenerator
EVs: 248 HP / 96 Def / 160 SpD
Sassy Nature
- Leaf Storm
- Earthquake
- Knock Off
- Hidden Power [Fire]
Slowbro @ Leftovers
Ability: Regenerator
EVs: 248 HP / 236 Def / 24 SpD
Bold Nature
- Scald
- Psyshock
- Calm Mind
- Slack Off
Ability: Regenerator
EVs: 248 HP / 96 Def / 160 SpD
Sassy Nature
- Leaf Storm
- Earthquake
- Knock Off
- Hidden Power [Fire]
Slowbro @ Leftovers
Ability: Regenerator
EVs: 248 HP / 236 Def / 24 SpD
Bold Nature
- Scald
- Psyshock
- Calm Mind
- Slack Off
Tangrowth actually puts in a good amount of work vs this team, being able to take hits from most of the members and threatening a majority of them upon switchin. It can switch into Latias, Gyarados, Raikou, and Breloom and threaten them with Knock Off, Earthquake, and HP Fire respectively. Likewise Heatran and Jirachi can't switch into Knock Off or Earthquake very comfortably, with Jirachi losing its scarf. Slowbro helps with Heatran and has no trouble switchin into Jirachi and makes a nice regen core that this team has a lot of trouble breaking. Extra defensive investment on Tangrowth lets it take on Mega Gyara better, avoiding the 2HKO from +1 Crunch.