The easiest digimon to get Beelzemon with is Guilmon. Train Guilmon to level 40 to get Gallantmon, Gallantmon at level 10 will learn Grizzmon. Train Grizzmon to level 50 to get GrapLeomon. Train GrapLeomon's Dark Tolerance to 160 and his level to 20 and he will learn Devimon. Train Devimon to level 50, you will get Myotismon. Train Myotismon to level 99, you will get MaloMyotismon. Train him to level 40. If you have Gallantmon and MaloMyotismon at level 40, you will get Beelzemon.