As for the Pikachu, theres no rational explanation
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First main phase: When you can play lands, creatures, planeswalkers, artifacts, and sorceries, Combat phase: When you hurl your creatures towards your opponent, Second main phase: When you get lands, creatures, sorceries, etc
These are both mechanics that are pretty par for the course, and both seem pretty minor compared to other abilities
[2] "Pokmon Gallery: Encounter with Shiny Pokmon" by Ken Sugimori Charizard is the only Pokmon not in the Alola Pokdex to be a Ride Pokmon in Sun and Moon (where it is unobtainable via normal gameplay) and Ultra Sun and Ultra Moon
While it's fetched a pretty penny at auction, this #2 Trainer card is not the most expensive trophy Pokmon card ever sold