It is the case that Pokémon today is much, much different from Pokémon as it was in its early days. Back then there were only the main series games (plus a few spinoffs) for anyone to deal with, along with the related media (mostly the anime). Now there are many games to deal with - quite a few of them free to play or start - and the associated media is also just as many, making it a very diverse world, even for me as a long-time and devoted fan. For that, the matter of "relevance" seems to become pertinent, for whatever it is that a person would like to deal with involving Pokémon, and this applies to me personally as well. As such, it seems relevant (ahem) to figure out what would be pertinent for Pokémon fans like me to deal with.
Being active in Pokémon may surely demand involvement in at least one game, if not to keep up with at least some of the latest information and developments, which theoretically can be done without playing a game but might be difficult. Meanwhile, the games themselves now have a "social capacity", which is somewhat to quite high for the likes of Pokémon Go and Pokémon Unite as well as the physical TCG, and less so for the main series games, virtual TCG, and some other spinoff games. Relevance may have to be evaluated in terms of this "social capacity" in addition to how much time and effort one can devote. This has been an ongoing progression for me even now, seemingly coming to a head in recent times and happenings.
Relevance may also be considered in terms of contributions that one can make, whether verbal (as in the case of this blog), artistic (as with some artists I already do know well and others not that well), and social management outside of the games as above. They may not suggest or require playing one, some, or all of the games, but what is gained from those efforts might just help in this regard. Personal considerations - that is for me - may just dictate an "amping up" in this regard, though that may depend on other commitments and necessities. For other fans, it may be that media and social contributions are sufficient without having to make their way in the games, and the relevance would be evaluated according to those contributions.
After all that, it would seem that Pokémon "relevance" for me is still sufficiently major, yet it also may seem that some efforts to demonstrate that relevance have to be redirected to certain other games or forms of media, and it may even have to involve dialing back on some social aspects - this blog being possibly the only exception. Other people (fans) can make the same establishment of relevance based on areas or aspects of Pokémon they deal with and/or enjoy, and that is perfectly fine. Nevertheless, nothing changes the fact that Pokémon today has become extremely different from Pokémon yesterday, and the efforts of maintaining relevance will continue to depend on the changes that transpire for Pokémon and its fans.
One year ago: Historical Pokémon, Revisited
Two years ago: Pikachu and Paldea Starters Headbands and Visors
Three years ago: My Current Holowear of Interest
Four years ago: In Need of Rotom, Right Now
Five years ago: Fanboys and Fangirls
Six years ago: The First Unova Saga Japanese Opening Theme
Seven years ago: Pokémon Go Community Day, 4/15/2018
Eight years ago: Dialectics