>>34552339He doesn't NEED to deal with ground types. Thundurus-T is a powerful wall breaker that needs to rip apart defensive cores, not sweep outright against full teams which it's too slow to do anyway. The only relevant defensive ground type in OU is Lando-T, and look:
+2 252 SpA Life Orb Thundurus-Therian Hidden Power Flying vs. 252 HP / 24 SpD Landorus-Therian: 324-382 (84.8 - 100%) -- 81.3% chance to OHKO after Stealth Rock
You can switch focus blast out for grass knot if you're that desperately worried about hippowdon and quagsire anyway.
