Cyclizar and the two legendaries it probably evolves into appear very important to the games. Is it possible to progress through the game without them being a part of your team?
This will contain minor spoilers for Scarlet and Violet regarding the legendries, but no new Pokemon will be spoiled.
Very early on, you are given your box art Pokemon exclusively as a ride Pokemon instead of Cyclizar. You cannot obtain the box legends to utilize in battle until later in the game.
Source: Leaks. (Experience after the release of the game). Edit: Changed up some of the wording and the source as I am now confident what occurs while playing the game.
No, because we have Koraidon and Miraidon so we do not need Cyclizar to be able to get around.