Use the Free Action incap when Riddler has a TOKEN on him. Essentially, it just allows him to incap when he's got a token, when he's pushed, or when he's clear.

Nasty.

now what happens if u have stunning blow on him? so say u roll and hit then u call 4 and none show up does he still take damage? or does the number have to come up for him to take damage.

STUNNING BLOW
Cost: 10
Prerequisite: Incapacitate
Choose a character. When the character makes a successful
attack using Incapacitate, in addition to the normal effect of
Incapacitate the character may deal damage equal to it
unmodified damage value. The attacker may choose how to
divide damage dealt among the successfully hit targets.

Riddle Me This: The Riddler can use Incapacitate once per
turn. He can use it normally or as a free action targeting a
single opposing character if he has been given and will take
no other free actions that turn. When he uses Incapacitate as
a free action and successfully hits a target, choose a number
from 1 to 6 and roll 2d6. If the chosen number comes up on
either die, Incapacitate resolves normally; if the chosen
number comes up on both dice, give the target enough action
tokens so that it has two action tokens if it has zero action
tokens.

even though your number did not come up u still hit with incap.
If this is the case he would be great with Stunning blow its turns into a free attack plus a possible incap then a normal attack.

If the number you called out doesn't even show up, you hit nothing.

One # shows up, you drop a token. Stunning Blow should work.

Both # shows up, you drop two tokens. SB should work.

but the way it is that u have to hit suscefully with inacp then roll to see how many tokens would be put on wich would be 0/1/2 but u still hit with incap. stunning blow says resolve normally well if number did not come up then it would be resolved with 0 tokens and damage.

You're asking whether the SB damage still goes through if the # you call out doesn't show up?

He IS using Incap at the time, the # called out doesn't come, but he DID use Incap, so yes, I'd rule that the Damage is still applied...just not with tokens.