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Your rival is named Blue, but you can name him anything else in the start of the game when Professor Oak forgets his name
Team Rocket is the gang in this game, who are trying to steal Pokemon to give to Giovanni
To become part of the gym challenge, you will have to get an endorsement. Bede gets an endorsement from Chairman Rose and his secretary Oleana
Mewtwo is the clone legendary. The other legendaries will be three birds, who will be Electric, Ice, and Fire types. Don't recall their names
You can get either an ammonite or a trilobite from the fossils at Mt Moon. The old amber gives you a pterosaur
Sonia is Leon's former rival who is researching the dynamax phenomenon at the behest of her grandmother and professor of the game.
Some pokemon, like Machoke, will have trade evolutions, like Machamp. Machamp has four arms
Ratatta and Raticake iirc are rat pokemon with an attack that takes half of the opponent's current health
The fourth gym is the Grass gym, led by a gardener named Erika. Brock, Misty, and Lt Surge are the first ones.
Before fighting the gym leaders, you have to complete the gym challenges.
- Brock hasa single weak trainer with Geodude, a rock with arms, and Sandshrew, a pangolin/armadillo
- Misty has more trainers with Water-type pokemon. Her gym looks like the scary maze game's third stage with the exorcist girl
- Lt Surge requires you to find two switches in the trash cans
More to come