I stuck attack+3 on my Ninian, supported her with Marthcina and set her loose on TT autobattle to level up. Got a weaponless Clarine for healing and a fourth character for filler (Clarisse right now, will switch to Hector at 40). Seems to be working out so far, I started this maybe 10 minutes ago and they're already gone from level 20 to 36.
Anyways, while it's good that people who missed out on Quickened Pulse can get it this time, making it a 6000 point reward means that you should expect to see it on every single arena Reinhardt/Brave Bow user. It wasn't rare before, but I'd still put it at maybe 1 in 3 Reinhardts running QP/moonbow. And much less common in lower point tiers.
edit: alright, everyone's 40 now and doing the second-highest difficulty on auto. Hector is actually real bad at this so I subbed in Ursula who is a machine. Falchion + Renewal on 'Marth' is actually pretty fun in here because she gets both heals at the start of every map. And then I have QP+Sol as well for some pretty good sustained healing. They still seem to wipe on the last map but I haven't learned all skills or tweaked the team yet.