And despite that, it's actually pretty good for Singles and a staple of what gave it a niche in OU right now.
For those unknowing, Zygarde is a Top Threat in OU's current metagame, for the same reasons it's been good back in G7: Only really needs 1 move in Thousand Arrows, and it can get by would be annoying mons through its sheer bulk & ability to spread status with either Toxic or Glare, in something like DD or Coil/TArrows/Sub/Status
Zarude comes in with his Bulk Up set with Jungle Healing, which heals 25% which is negligeable, but appreciated, but most importantly, also heals status. This, on top of winning the setup war with Bulk Up, being able to break Subs regardless of Coil Defense Boosts given its access to STAB Darkest Lariat which ignores Stat Changes, makes it a pretty neat Pokémon to beat Zygarde. Its good base HP also lets it be built with enough HP investment for Jungle Healing to heal more than what Seismic Toss/Night Shade would do, letting Zarude also make the Blobs into even harder setup fodders.
Funny how things turn out.