QIf I put 2 followers into my EX area with this spell, do I give my leader +4 defense?

ANo, you still only give +2 defense.

QIf I put a follower into my EX area with this spell, does it lose all effects applied to it, changes to its attack or defense, and its counters?

AYes, it does.

QIf I select a token for this spell, does it get removed from the game?

ANo. It remains in its owner's EX area.

If a token is a follower or amulet, it may exist in the EX area, the field, or the resolution zone. When a token is moved to a zone where it may not exist, it's removed from the game immediately after movement.

QIf my opponent declares an attack on one of my Pixie followers, and I select that Pixie follower for this spell, what happens?

AYou first resolve this spell, putting your Pixie follower into its owner's EX area. Then, since the attack target is no longer on the field, the attack ends without the two followers having fought. The attacking follower remains in an engaged state.