Maximum level

[kibasoul]

Is it possible for everyone to be promoted and lvl 20 at the end of the game?

[Marco]

On Hard Mode.

Normal Mode lacks the enemies to get everyone on your final team to 20. Everyone will be 15-20 at best.

[VincentASM is too important to have a messed up name]

Wouldn't it be easier in Easy Mode?

There's less enemies, but you get much more Bonus EXP compared to the other modes, and slightly more Battle EXP as well (i.e faster boss-abuse as well, if you like that).

[hyde]

You say slightly more Battle EXP, but how much is it? It always seems like I'm getting a lot more experience than on Hard Mode.

Of course, getting slightly more a lot of times means that you're still getting a lot more. So it does make sense. >_>

[Marco]

Wouldn't it be easier in Easy Mode?

There's less enemies, but you get much more Bonus EXP compared to the other modes, and slightly more Battle EXP as well (i.e faster boss-abuse as well, if you like that).

It wouldn't be enough to cover everyone. The reason why you get a lot of Bonus EXP is the cover the fact that there are far less enemies. It's pretty much the same as Normal mode.

[kibasoul]

all my  characters are promoted at least but i cant get them to lvl 20

[Neofox]

You say slightly more Battle EXP, but how much is it? It always seems like I'm getting a lot more experience than on Hard Mode.

Lethe (who counts as a prepromote) gets 33 EXP for killing an unpromoted unit in the mission she joins on easy mode, so it's apparently quite a lot more than normal.

[Kahane]

BoNam'oLafs

Well, on the easy mode playthrough I did for the purpose of data transfer to FE10 I levelled Ike, Mia, Zihark, Nephenee, Shinon, Gatrie, Kevin, Stella, Marcia, Haar, Soren, Rhys, Mist and Volke to 20/20. Before the Final Chapter I used the remaining BEXP to get Geoffrey to level 20 just for fun. And getting Nasir and Naesala to level 20 shouldn’t be a problem at all. I didn’t abuse anything (for EXP at least . . . BEXP helped in capping stats though).
Getting EXP wasn’t hard at all. (Though Rolf’s absence was helpful.)
Getting Nephenee’s Def to 28 on the other hand . . . 

[VincentASM is too important to have a messed up name]

Alright, I checked and in Easy (compared to Normal) you get 5 more EXP for damaging an enemy and 15 more (if it's a boss, 25 more) for killing them.

[UchihaHunter]

It's pretty easy to cap Neph's def btw.  I find Fixed mode more useful for capping stats than sitting there abusing BEXP.  And Easy Mode makes it ridiculously easy to get a lot of people to 20/20, as people have already stated.