This team might look a little bit silly, but Lightningrod is actually fantastic in a Triple Battle, especially with Wailmer being the core of my team. Electrike can suck up those super effective Electric-type attacks, meaning only Grass type can threaten Wailmer. My usual game plan is for him and Flaafy to Thunder Wave the entire enemy team, then fire off multi-target Leer and Growl and dance around to dodge attacks while blubber buddy goes ham with Rollout and tanks the incoming hits with his huge HP pool. I'll pick up one more Pokemon and then it's on to gym one! I've also included a picture of the type of nonsense I've been dealing with...

Levels have been pumped up by 20% to account for extra XP, so I'm still just under the cap. If you want to try this mode out yourself, you can find the triple battle mod and instructions here: https://michaeldoescoding.net/tools/pokemon/gen5/triplebattles.html