You only need 2 characters for the combo, your launcher, you can use alicia or leone. But since you need leone to be on level 40+ before end of chapter 3 then she is a good choice. Then for the 2 filler characters, you may want to choose anyone you want to level up. But its a big bonus to choose someone with multi hit attack specially lightning bolt.

The place is Crawsus Ruins in Chapter 3, and you can fight the hydra infinite time. Using this method, in 2 hrs, you can get anyone at lvl 40.

We will be spending a lot of time on this game valkyie profile 2, if there is a specific video regarding this game, you may send me a request. You can also catch my stream on this yt channel where I post my gaming streams and other videos.
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