The only reason you can't go past the move even though he already has it is because you might hit the next level for a move and he could have 4 moves and you've have to choose to replace or not.

+Ivysaur.
-braixen.

Luke888 Used A Special Move on Grovyle, Luke888 commands Grovyle to use Leaf Blade on Frogadier!

+ Grovyle

-Frogadier (Leaf Blade)

I'll use a potion on Dartrix

+ Dartrix
- Braixen

I’ll buy and use a super potion on Frogadier

+Frogadier
-Combusken

I use a potion on Nintetales.

+ Ninetales
- Dartrix

I'll buy and sunny day and special move and I'll use the sunny day
+ninetails (Fire Blast)
-Dartrix

I buy a special move for Ninetales.

+Ninetales
-Ivysaur (Fire Blast)

I'll buy a rare candy pack and use 3 rare candies on Ivysaur and 2 on Grovyle.

+Grovyle
-Braixen

Ivysaur is definitely dead after stardoor's post. 0% survival chance.