Pym Particle Control allows transforming to tiny when Antman/Wasp would suffer a collision.
Based on another rules post my understanding on when Antman/Wasp are thrown the order of operations is:
"Targeted for throw, moved by the throw, Pym Particle Control, and resolve the collision is the correct order."
When Resolving the Collision, if Antman/Wasp was thrown into another model (who would then need to Dodge the Collision) would the other model be dodging a Size 1 or Size 2 Antman/Wasp?