A straightforward way to know how high your Greater Dragon will go - -
(1) screenshot the skills before you tame it.
(2) in Windows Calculator, multiply these values by 90%. So like, 136.4 wrestling pre-tame equals 122.76, if you did it right. You hit the percent button instead of the equals button to get the figure.
(3) bump the last decimal up by .1. I don't know why this is the case, but anyway.. the Dragon with 136.4 pre-tame wrestling skill should train up to 122.8 post-tame.
Magery, mercifully, automatically pops in at that 90% pre-tame value, and doesn't need to be trained
Anatomy, eval, and med are capped at 100.
Someone was saying that post-tame Magery can go higher than the 90% pre-tame value, but for the life of me I cannot make this happen. I went as far to try discord training and forcing the dragon to completely mana dump (high-end spells) repeatedly, and it wouldn't budge above cap (it took a paragon cu sidhe to withstand that kind of abuse without dropping dead, heh).