Dynamax Vespiquen

Dynamax Vespiquen is an extremely interesting Pokemon. On paper, it's a bit of a mediocre defensive option with access to a 0.5 second Fast Move and a few resistance advantages. However, those resistances are where things get interesting; Vespiquen covers the weaknesses of top-tier defenders like Dynamax Blissey and Zamazenta perfectly, thanks in particular its double-resistance to Fighting and triple resistance to Ground. This mean that a combo of either or both of the above plus Dynamax Vespiquen can wall just about everything.

All that said, Dynamax Vespiquen is still a bit weak in general. If the Max Raid Boss happens to roll a moveset that isn't resisted by Vespiquen, then it's not going to last extremely well, and it doesn't have much utility outside of raids where it's a dedicated counter. On top of that, all it's going to take is the release of a moveset update to Dynamax Lugia or a few others for Vespiquen to be completely outclassed in its only niche.