Event Pokémon have long been a staple in the franchise, ranging back to almost the beginning of the game series. Featuring Pokémon such as Celebi, Jirachi, Decoys, Manaphy, Victini, etc. Should they keep doing event Pokémon? What kind of event Pokémon do you want? Any special typings? I like event Pokémon, but they should honestly be made easy to access eventually, because all Pokémon should be accessible, imo. They should keep doing event Pokémon.
I'm not gonna lie, I don't like Mythical Pokémon. They are usually just for the sake of being an event and to be an excuse for a new (and probably bad) movie, lacking the amount of lore a legendary Pokémon need to be an actually good addition to the game itself. Unfortunately for me, I'm pretty sure they will continue making them the same exact way. As a side note, Deoxys got the event only treatment for a very long time until it surprisingly appeared in ORAS, so I think other events can do the same thing (some of them have it easier than others, tho) Despite that, if I had to chose a type for a new one a would say Poison. We need more legendary poison.
Event Pokémon are alright to me, but they're been handled a little disappointingly in the past. I remember when events gave out items that actually took you to new locations and such, where you'd have to battle and catch these new, unknown Pokémon. Now they just hand you the thing like they're practically worthless, which honestly really takes away their value in my opinion. If they bring back those cool event quests, I'm super down for it. Otherwise, not so much.
I'd prefer if they do more than just handing us the legends, like do back to the days where it was a little quest to get them do we could get some lore about the mon instead of just having a guy at a pokémon center hands us ridiculous mons like Arceus. Some sort of story would be nice then at the end of it all we could meet the legend and get to battle and catch it.
Agreed: That Arceus event that was never (?) actually initiated for HGSS and DPPT seems like it added a few extra hours of gameplay. Like you unlock a new area of Mt Coronet in Sinnoh to catch Arceus, then you transfer that same Arceus to Johto to unlock a smaller dungeon in the Ruins of Alph and explore a totally new area there too, or some weird combination like that. That's more fun than "You want a shiny Zygarde? I got your shiny Zygarde: just get yourself over to gamestop and bam, it's all yours." I want to chase Mew on an imaginary island or command Arceus to make a new universe just so I can have a level 1 DPPT mascot or something. I hope they do something like that in 8.
I'd prefer it if the things were actually in the game - I am getting pretty sick and tired of missing timed events, or having them distributed through stores that don't even have them 90% of the time. By all means, do these things, but don't make them the only way to obtain the Pokémon in question.