Release Grab:
Due to the extended lag animation when the characters Ness, Lucas and Squirtle suffer when breaking from a Grab, Marth is able to perform an infinite known as a Release Grab. By grabbing, repeatedly attacking until the other character breaks free and then re-grabbing again, Marth is able to wrack up damage endlessly. Lucas is the more difficult of the two Earthbound characters to use this on, but it is still possible with frame perfect precision. Once Ness and Lucas have reached a high %, DSmash for the kill. Squirtle must be forced into a Jump Break for this to work, and although it isn't infinite, it does lead to a guaranteed Dair Spike.