Dreamcap Captain R
From the Super Mario Wiki
Dreamcap Captains R are multi-colored, supposedly layered Capnap-like creatures that appear in Mario & Luigi: Dream Team. They are stronger counterparts of the Dreamcap Captains, possessing higher stats. In the field, Dreamcap Captains R wander around aimlessly if undisturbed, and charge at Mario and Dreamy Luigi upon sight.
In battle, Dreamcap Captains R and Dreamcaps R fight together in hordes. If all the Dreamcap Captains R are defeated and any Dreamcaps R remain, the Dreamcaps R will huddle together and one will run away with each turn that passes afterward. If all the Dreamcaps R are defeated and any Dreamcap Captains R remain, they will summon several more Dreamcaps R to then be able to attack.
The group can charge towards Mario as a pack, where Mario must move out of the way or jump over the incoming enemies in order to avoid taking damage. The horde can also attack from the background, charging towards Mario in rows, which Mario must jump over or on to in order to avoid the attack. The Dreamcaps R and Dreamcap Captains R may split into multiple towers, which subsequently ram into Mario unless hammered away.