I know I've brought this up before but it didn't get much attention: isn't ORAS an awful (or at least questionable) timing for releasing megas like Beedrill and Pidgeot? First, they are much more related to the Kanto games than other Kanto pokémon such as Slowbro. Not many people have ever used Slowpokes on their FRLG runs, but I doubt you'll find someone who haven't caught a Weedle or at least a Pidgey.
Most people don't use Slowpoke while doing a Kanto run because it's so late to obtain, relatively speaking, and by that point in time, there are superior Water types to use, rather than raising a Slowpoke (which has fairly mediocre stats) to level 37. Also, while previously Weedle and Pidgey weren't in the Hoenn dex, they're absurdly common on Wondertrade, which makes them fairly to obtain (assuming WT is in the Hoenn, can't remember if it was said to be or not), and they could always throw them into the new regional dex.