How can I take care of Colossus?

Hint 1 of 9:

You'll eventually find out that he's very allergic to pollen.

Hint 2 of 9:

So find some pollen to use on him.

Hint 3 of 9:

It would help if you could get close to his face.

Hint 4 of 9:

That helmet is going to be a problem.

Hint 5 of 9:

But you can get rid of it with the catapult.

Hint 6 of 9:

Set it to the far length and shoot a rock at him.  The helmet will come off.

Hint 7 of 9:

Now all you need is a helper small enough to crawl on Colossus's face.

Hint 8 of 9:

The speck on the cloud screen is very small.