Awesome, now it's Agatha time! First, buy an Earthquake TM and give it to Venusaur.
Charizard Fire Blast
Venusaur Earthquake
Gengar Poison Jab on Umbreon, Shadow Ball on the other 2
cross fingers again.
Sitrus Berry on Charizard
A2: Challenge Lorelei
Charizard Fire Blast on Glaceon and Jynx
Gengar Shadow Ball
Venusaur Solarbeam on Lapras
and cross my fingers
Buy a sitrus berry and give to Venusaur
A2
Challenge Lorelei
Charmander Flamethrower on Glaceon and Jynx
Gengar Shadow Ball on anything left
Venusaur Solarbeam on Lapras
A3 Challenge Bruno
Venusaur Solarbeam on Onyx and Poliwrath
Gengar Shadow Ball on Machamp
Gyarados cleans up with Hyper Beam if need be
A4 Explore Safari Zone
Pikachu egg should be hatched, yeah?
Anyways, purchase a safari zone pass and start exploring that place! I heard the warden's gold teeth are there or something... gross. (Action 3)