I've been wondering lately why Pokémon type groups include/exclude Pokémon that aren't the type that the group is based on. [Example: Dragon-type group doesn't have Altaria because it doesn't seem dragon-like, even though it's considered a Dragon-type in the game.] That's like having a Pokémon group on a different forum, but not including 4th and 5th generation because they don't seem like Pokémon... I don't really have an issue with including a few Pokémon that aren't the type of the group, but removing Pokémon of that type seems somewhat silly to me.
Hopefully this was the best place to post this.
Considering the Dragon's Den, let me, the soon-to-be co-owner, help you out.
I think I'm speaking for the most active members if not for the majority of the Dragon's Den if I say that we consider the group not a fanclub of the Dragon type, but just Dragon Pokémon. Coincidentally, most Pokémon we think are Dragons have the Dragon type, and while a Pokémon being Dragon-typed is a very heavy argument for a Pokémon being a Dragon, it's not definite proof of it. We take moves, breeding groups and above all
looks and origins in account when deciding what Pokémon are Dragons. Some months ago, we voted on wether Altaria was a Dragon or a bird, and for that I made
this document. The majority of the members voted that Altaria was a bird, so he was removed from the club.
Also note that in first post it says debate is always open, meaning you can alwas start a discussion on what Pokémon you think should be added or removed from the club, given you have good arguments.
I personally think it's unnecessary that there exist clubs for certain types of Pokémon. Note that this is just my opinion, because I cannot like a Pokémon simply because of its type. I decide for myself what categories of Pokémon I like, and that might be Dragons, of Bugs, ot whatever. I like Pokémon because of their appearances and origins, not because of their types.
I hope you enjoyed reading my rant as much as I did writing it. By no means I want to offend anyone, I'm just expressing my opinion.