This is the battle before the last battle against Galacticmon.
Q: How do i get 9999 HP ? A : I used a gameshark code.
Q: How do i get all stats 999 ? A: I bought training chips from black market at AM City. That was before going the Master Room for the final fight immediately.
Q: How do I evade so easily ? A : That is for sure as I increased all my stats to 999. But the result of easy evading is raising your "Wisdom, Defense and Spirit" to 999. Also, use different combination of keys while evading.