Historyxmaker

As some friends of mine started their journey to Sinnoh and fought the 6 trainers they stumbled upon the Machomp of Hannah (probably the strongest trainer). They used a Gyarados with bounce to attack it. After using the ability and Gyarados went into the air Machomp just completely Pogchamped us by using Thunderpunch and actually hittig it.... which he shouldn´t be able to hit while Gyarados was in the semi-invulnerable stage of bounce. We looked up if we were right and some Wikis and sites just confirmed our assumption (as seen e.g. here https://bulbapedia.bulbagarden.net/wiki/Bounce_(move) ) We asked ourselves if this is the only move that can hit a Pokemon while being in a semi-invulnerable stage of for example fly and bounce. Would be nice of you guys to check this issue out :) Thank you for all your help and keep up the great work guys. You are awesome and this game is just one hell of a nostalgic trip and a wonderful gift for all of us. In love the community