How to correctly levelup MetaPet 120 Taming ?

Alucard

Grandmaster
my story:
on Tamer1 i have 6 lvl Dragon with XP Progress (~6 000000) > 3000 000 on 7 lvl , but without 120 Taming he did not rise.
i transfer this Dragon to another Tamer with 120 Taming....Dragon not didn't receive 7 Stage and Lost all XP Progress

so how correctly levelup MetaPet with 120 Taming fast ? help please
 
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