It just seems for this episode the team wanted to promote their silly Gen 1 games. The Let's Go games are quite clearly set in a completely different universe, with different protagonists and a different rival "Trace" that is significantly worse than "Blue" who actually makes for a very compelling rival in the games story. Green, to me, is so much better off being left in the manga. BUT, I would of absolutely been in shock if they decided to go with the superior character "Leaf" instead. Green is a fantasticly written character in this episode and is voiced by Cristina Vee, which I noticed quite quickly due to her distinct voice. These games are both considered canon and those games are actually good (opinion). Again, this is my opinion, but I really, really wish that they based this final episode on either the original Red, Green and Blue games or FireRed and LeafGreen. The last episode, entitled "The Discovery" is based off of the Pokémon Let's Go games. Again, this is an extremely stupid thing for me to complain about but I do slightly wish they chose the original Sun and Moon to base their game around since USUM is technically not connected to the rest of the episodes in the same universe. Ultra Sun and Ultra Moon have already been said in the past to be part of an alternate universe. One of my favourite episodes is the Ultra Sun and Ultra Moon episode with Lillie and the ultra wormhole entitled "The Eclipse". Some episodes I wish focused more on the REAL canon of the Pokémon universe. I do have some nitpicks however, but they are based mostly around my bias and opinion. People actually care about the world of Pokémon so a lot of this show will make many fans quite happy. It deserves this kind of medium in this way. This is Pokémon, one of the biggest video game franchises of all-time. The animation in all of these episodes is stunning to say the least and I really think the studio went all-out with the visuals here. I especially appreciate the specific stories told here. Rely on prior knowledge of the video games to enjoy. I absolutely love Pokémon Origins and Pokémon Generations but I cannot deny that these series'
POKEMON OMEGA RED EVOLUTIONS SERIES
This series in particular REQUIRES you to have played the video games. Obviously these episodes rely heavily on fanservice. This mini-series is not without its flaws however. There are 8 episodes, 1 for each region and I like every one. I've always found myself loving any Pokémon anime episodes, trailers or shorts that aren't part of the Ash Pokémon series and are more connected to the actual lore of the video games. As a fan of Pokémon many of these short episodes make me quite happy.