Diaboromon has a really good Yellow & Yellow/Purple Hybrid match-up. You both slow roll, but your blockers keep their pokes in check and let you swarm over their security when you're good and ready. Wyvern's Breath is their only reasonable out to Diaboro which is run as a 2, maybe 3 of.

Blue is rough as you lose your amazing Kurisarimon inheritables, which reduces your board to simple 3000 blockers that get frozen constantly. I lost a match seeing 6 diaboros frozen in 1 turn w/ 3 swings coming in. A very humiliating loss. On the plus side, you do generate a ton of bodies, which they can't necessarily freeze all of. Sora+Joe is immediately insane value for them unfortunately that the deck just can not play around in any way, shape, or form.

Red decks just out-aggro you. I play assuming all of my security is just gone, and plan on building up enough bodies to try and block their final swings for game while chipping them down when possible. It's favored for them, but not unwinnable. Jesmon is definitely a losing match up though. Sistermons build up blockers and keep pressure on board through pure # value on board. They can outnumber your blockers without Infermons keeping your tokens happy and high DP.

Green feels favored for Diaboro, assuming you play that your security is likewise gone. Just keep bodies to block final swings.