Chaos Gallantmon is an often overlooked Pokemon, and for good reason. While it has great defensive stats, its HP is lacking, and it simply can't stand up to the powerhouses that rampage through the Uber tier. It also receives competition from its sibling formes, most of which can play the support role better. Despite its tragic shortcomings, Chaos Gallantmon can still help a team out with its fairly vast support movepool. Also, it's typing gives it no resisting coverage, and that means he can easily rampage through teams, since he has access to both Swords Dance, and Nasty Plot. A key immunity, and 4x resistance to psychic and dark types respectively is amazing. However, you can't just throw it on your team at once, and definitely needs support.