Airdramon can digivolve from Betamon to obtain him the owner must make 4 or more care mistakes, train 8-31 times, overfeed 0-3 times and have 9 or more sleep distrubences. He can further digivolve to MetalGreymon by fighting in 15 or more battle and winning at least 80 percent of the battles.  These requirements are weird because they are horrible conditions but in fact Airdramon is the strongest champion.
Airdramon is #89 in Digimon World Dawn and Dusk, and is a Balance-class Dragon species Digimon with a resistance to the Fire element and a weakness to the Earth. Its basic stats are 147 HP, 180 MP, 85 Attack, 93 Defense, 91 Spirit, 94 Speed, and 35 Aptitude. It possesses the Speed 3 and Sylph Aegis 4 traits