if garruk relentless flips can i activate another ability?

[SlowFast]

if garruk relentless flips can i activate another ability same turn?

[Arix]

No.

[battlefield]

I think it can, because it is still the same object it just changed characteristics, so it is not affected by summoning sickness?

[Arix]

It has nothing to do with summoning sickness, it's to do with the "one loyalty ability per turn" rule. You already activated one of Garruk's abilities this turn, so you can't activate another.

[SlowFast]

I mean activate an ability of Garruk, the Veil-Cursed

[Arix]

It's still the same planeswalker.