Good Skills for Boey?

been using gronnraven + triangle adept and bowbreaker to make him a meta counter and thats been working well to deal with the abundance of brave lyn and reinhardts in high level arena.

What are his IVs?

His Atk is below average, which means he could just easily use Gronnraven + TA to win the MU he technically already wins, but heavily heavily in his favour (including colourless).

Another thing you could go for is Gronnblade with Fury (with +Def in mind), that way he's ridiculously durable and hits really hard. With a charged Ignis, he can 1RKO Reds with lower Res like Lucina and Ryoma I'm sure.

For B-slot skills, if you're going for TA build, just give him QR and he becomes heavily bait and tank oriented. Otherwise, keep Renewal if you go Fury.

I currently have raven TA3 unit in my main roster, but i also plan to use Boey, just not in usual way. he will be my healer and strong blue check. The plan is to put blade+ on him, TA3, renewal and aid. With +atk, hone speed and hone atk he goes to 82 effective atk on blue units.

Try to survive that.

But thats just specific build for me, since i miss healer and good blue check, i just hop it can give you an idea, that TA raven is not his only option. :)