I just thought about something in the anime. As you know, Ash usually don't stay at his home for much time between journeys. As soon as one journey ends, he starts another. However, between the end of Kalos and the start of Alola, that didn't happen. Ash spent an unseen quantity of time at Pallet Town before winning the journey to Alola and traveling through it.
That makes me think, could have some unseen events taken place in this timeskip? When Ash returned Kanto with his class, Rotom took pictures of several Pokemon that could mean they returned to Ash between Kalos and Unova. I would like to believe this theory, although they would need to confirm them. Let's see which are these events:
+ Ash's Squirtle: Weird enough, not just Ash's Squirtle, but the whole Squirtle Squad were at Oak's Lab and Rotom took a picture of them. I would truly like to see Ash's first Water Type living at Oak's Lab. Maybe Officer Jenny got new Firemen after all this time?
+ Ash's Pidgeot: Rotom took picture of a Pidgeot flying with a Pidgey and a Pidgeotto. It could be Ash's Pidgeot, since he was released in the wild very close to Pallet Town. Ash's king of flyers would be very useful to Ash.
+ Ash's Primeape: We didn't see Primeape between Rotom's pictures, but I would like to believe he finally returned after so much time, as he wasn't released back into the wild after all.
+ Ash's Haunter (???): We saw a "Ghostly Trio" very similar to the one that Haunter belonged between Rotom's photos, but I wouldn't count on being the same ones.
What do you think?
That makes me think, could have some unseen events taken place in this timeskip? When Ash returned Kanto with his class, Rotom took pictures of several Pokemon that could mean they returned to Ash between Kalos and Unova. I would like to believe this theory, although they would need to confirm them. Let's see which are these events:
+ Ash's Squirtle: Weird enough, not just Ash's Squirtle, but the whole Squirtle Squad were at Oak's Lab and Rotom took a picture of them. I would truly like to see Ash's first Water Type living at Oak's Lab. Maybe Officer Jenny got new Firemen after all this time?
+ Ash's Pidgeot: Rotom took picture of a Pidgeot flying with a Pidgey and a Pidgeotto. It could be Ash's Pidgeot, since he was released in the wild very close to Pallet Town. Ash's king of flyers would be very useful to Ash.
+ Ash's Primeape: We didn't see Primeape between Rotom's pictures, but I would like to believe he finally returned after so much time, as he wasn't released back into the wild after all.
+ Ash's Haunter (???): We saw a "Ghostly Trio" very similar to the one that Haunter belonged between Rotom's photos, but I wouldn't count on being the same ones.
What do you think?