of course status moves do work. At least my Ferrothorn with rocks + boom never had any problems with that link.
You lose priority on Quick Attack and similar moves. So FEAR is not really viable.Encore needs to be quick banned it breaks the battle
Also Rain is everywhere but beatable - trick room counters it nicely if one mon can just live a hit. For hawlucha I used a meme sceptile with unburden but it was pretty trash. that whimsicott set looks better but also gimmicky. Priority of any form is the best counter.
Finally, I haven't used it yet, but is FEAR finally viable? endeavor and attack in the same turn?
It may be better to give it Trick Room and Belly Drum as the link, so you can have an extra turn of Trick Room, and not obligate a teammate to be Trick Rooming for it (plus avoid taking damage on the switch in).So if you're running a TR team and you need a mega, I suggest that use this one. Weird compared to normal sets, but it definitely works.
Merciless (Slowbro-Mega) @ Slowbronite
Ability: Shell Armor
EVs: 248 HP / 252 Atk / 8 SpD
- Belly Drum
- Drain Punch
- Zen Headbutt
- Aqua Tail
Set up TR, and the rest is pretty straightforward.