Mansion, Blaine's gym (Seaking crushed him, and that's a phrase I would've never thought I'd write), detour to the Sevii Islands, Victory Road and onward.
Lorelei was kind of a hassle - Dewgong, Cloyster and Slowbro all went down to Electabuzz' Thunderbolts, but he didn't quite get Lapras. He took it down a good ways below half while it Surfed him down to about 1/3. I (unwisely) gambled on fainting it even after the Sitrus Berry heal and left it with a sliver and it fainted Electabuzz. Mimien mopped it up though with Shock Wave, then we chipped away at Jynx, in between awakening whoever she put to sleep. Nobody had a really good attack against her, but Scyther was the only one who was weak to her and had to stay out. IIRC, Seaking took her down with a Horn Attack.
Bruno was a breeze. Zynx opened against him and took out his Onyxes, then hit his Hitmonchan down to just a sliver of HP and it fainted her with a Mega Punch. Scyther came in and mopped up.
Agatha was okay. Zynx took out the first Gengar, Arbok and Golbat, but then fell to the second Gengar's Sludge Bomb. I switched in Mimien who took another Sludge Bomb but held on, and countered with a Psychic. I crossed my fingers and set up another Psychic (the first Sludge Bomb had done just about exactly half his HP worth of damage), but Gengar used Shadow Ball instead, for an easy KO. Then I just chipped away at it, Scyther first, then Seaking. Then the Haunter came in and I took the turn to revive Zynx and sacrificed Seaking, then switched Zynx in. Haunter hit with a Hypnosis and I took the next turn to awaken Zynx, expecting it to waste a turn on Dream Eater and instead it Cursed, so Zynx crushed it easily with a Psychic on the next turn.
Lance was mostly easy. Electabuzz took out Gyarados, then Zynx took out the first Dragonair and put a dent in the second one, and Seaking (who has Ice Beam) finished it off. Then Seaking went down surprisingly easily to an Aerodactyl Ancient Power (granted she was at only a bit more than half HP). I switched in Electabuzz and got off one Thunderbolt while it took an Ancient Power that knocked it down to about 1/3. I debated a bit and Max Revived Seaking and sacrificed Electabuzz, then Seaking Surfed the Aerodactyl away. Then Dragonite. Seaking hit it with an Ice Beam, but only knocked it down by about a third, while taking over half to an Outrage. I Max Revived Zynx and sacrificed Seaking, then Zynx one-shotted the Dragonite on the next turn.
And Gary. Pidgey went down to Electabuzz, then Tangela tanked an Earthquake and took out Rhydon with a Giga Drain, then Charizard came in and I switched in Seaking and they went at it. Fire Blast took about 1/3 from Seaking, while Surf took almost half from Charizard, so it was just a matter of holding out long enough. Then Exeggutor came in and Scyther crushed it. Then it was Alakazam. Pretty much everyone ended up involved in that fight, and it looked bleak until Mimien got up a Light Screen, then it turned finally. I deliberately brought Electabuzz in to deliver the final blow, and then he one-shotted Gyarados for the victory.