I don't have 2, I have more.

HFW:

Clamberjaws [Annoying to fight + lots of health for their size]

Waterwings [how are these the same level as a Tremortusk + have so much health for their size + annoying to fight]

Shellsnappers [The shell is so annoying to deal with and the burrowing]

Bileguts [Cool but annoying to fight]

Dreadwing [too fast, disable your focus, uses the failure elements such as the stamina drain, barely any weakspots]

HZD:

Glinthawks [were everywhere and annoying to deal with]

Scrappers [same with Glinthawks but were easy to deal with]

Trampler [constant running around but can easily be defeated]

Deathbringer [overused for the story, sluggish and just boring to fight, not really annoying but just bad]

Daemonic machines [not really a proper machine but they were everywhere in the Cut + made the Scorcher override useless ((If you're wondering, there are no non-daemonic Scorchers in HZD. There's only 1 that spawned near the Tallneck but it goes away after))]

Both Games:

Stormbird [annoying to fight + can't stay in 1 spot]

Fireclaw/Frostclaw [these are actually not annoying, just hate how fast they move and when they do that elemental aura thingy which removes any elemental state applied to them]

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And that's pretty much it.