When testing out items and moves in battle, I noticed that the move Fell Stinger, a contact move, didn't activate a rocky helmet. I did not test to see if it would happen to do the same with any other contact trigger such as static, flame body, etc.

Fell Stinger is a contact move, so it should've activated Rocky Helmet.

Hi there, Ale - thank you for your report! I can confirm that Fell Stinger does not seem to be counted as a "contact" move, as it is not being affected by items such as rocky helm, or abilities such as Flame Body or Static.

To confirm this, my method is as follows:
1) Made an NPC trainer with a low-level rattata, and give it a rocky helm; a zapdos with static ability; and a ponyta with flame body.
2) Gave myself a Beedrill with Fell Stinger. Tested the following moves - Fell Stinger incurred no retaliation via rocky helm. Fell Stinger never incurred paralysis or flame body after multiple attacks (30% chance, so I tested for several minutes for each ability).

As such, I'll send this issue to the internal tracker. Thank you!
Cheers!
Katzyn