Dena has inserted some mixed varieties into existing contents, i.e. adding missions into Legendary Arena, which I personally feel its fun and challenging.
Since you can always sacrifice 3 pawn units first and then use another 3 stronger units to beat the stages for the sake of the 3 missions. I decided to just go all out by beating it with 3v1 teams (obviously not using F2P units because it has already been showcased in the past, link: https://www.youtube.com/watch?v=xn5fcsn5AeA).
Burgh actually works quite well here because of its debuffing feature with Silver Wind Unfortuitous 9 (unlocked at 3/5), so not necessarily you have to be baited by Alder’s banner.
Content:
00:00 Theme – Gym Leader 3v1
05:23 Theme – Unova 3v1
08:17 Theme – Bug 3v1
11:56 Sync Grid, Lucky Skill, Theme Skill