This page explains how to defeat Elite Four Bertha.
Bertha is the second member of Sinnoh’s Elite Four, focusing on Ground-types. Be careful not to let this old lady grind you to a halt!
Elite Four Bertha
Bertha starts off by sending out Quagsire, an evolved Wooper. For attacks, it has STAB Surf and Earthquake. It’s also carrying Toxic and Recover and may try to stall you by recovering HP with Recover and its Leftovers. For a fast KO, use Grass-types. Whatever you do, don’t use Water-types because of Water Absorb.
Sudowoodo isn’t a Ground-type, but we’ll look the other way for now. It can use a hard-hitting Head Smash or a less impressive Double Edge–these moves don’t inflict recoil damage due to Rock Head. Besides that, it’s got Low Kick to hurt heavy foes and Sucker Punch to attack first if you use an attacking move. Sudowoodo isn’t very strong though, so a solid Water, Grass or Ground-type should do great.
Moving on, Golem can use STAB Stone Edge and Earthquake, Heavy Slam to take advantage of its weight and Rock Polish to greatly boost its Speed. Bertha’s Golem has Sturdy, so expect it to survive a round of combat, unless you can one-round it with Bullet Seed etc. Speaking of, Grass-types and also Water-types are extremely effective. You could also use Ground or Fighting-types.
Whiscash is another dual Water/Ground Pokémon. This one can use STAB Hydro Pump and Bulldoze–the latter will reduce your Speed. It’s also got Ice Beam to hurt Grass-types and Belch to deal damage by consuming its berry. Like with Quagsire, we suggest fielding a Grass-type. But keep in mind its Rindo Berry will weaken your first Grass move–and make sure you can survive an Ice Beam.
Bertha’s final Pokémon is Hippowdon. When it enters battle, its Sand Stream ability will cause a sand storm, damaging Pokémon that aren’t Ground, Rock or Steel. The sand will cause boost Hippowdon’s Special Defense. For attacks, it has STAB Earthquake, plus Ice Fang and Crunch. It can also Rest to restore all health, fall asleep and then wake up using its Chesto Berry. We recommend Water or Ice types.