JP Silver Glitch?

[Tbird]

I was just thinking back about when I had the JP Silver (I believe. It was a friend's who had gotten it before it before it had actually came out) many years ago now, and it just occurred to me that I had a sudowoodo or gyarados (it was one of those interact pokemon) that learnt HM fly.

I know that's really weird but did anyone else play this version of silver and experience anything similar? Or has anything about it been documented?

[Mr. Celebi]

Well, gyarados is a flying type also, so the glitch may have been a one time pokemon game thing.