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Highest CP: Tyranitar (2975), then a long run of Mewtwo in the 2900s, 2300s and 2200s. Some have a blue flower marker, and the 2222, 2221, 2213 and 1783 ones are the dark armored Mewtwo form.
Legendaries and Mythicals: Solgaleo (2857, 2276, 2231), Lunala (2837, 2821, 2244), Dialga (2832, 2739, with purple flame icons), Ho-Oh (2720), Rayquaza (2651, plus a shiny at 2123 and another at 1610), Necrozma (2605, 2071, 2066), Palkia (2214), Deoxys (2211), Zacian (2170, 2141), Zamazenta (2153, 2137), Xerneas (2110), Kyurem (2013)
Others: Gengar (2358 with a party hat, plus Halloween-hat versions), Garchomp (2343), Dragonite, Flamigo, Gholdengo, Magmar, Gyarados, Tyranitar (1738), Hitmonchan, Charizard (1604, 1585), Staraptor, Machoke, Starmie, Jolteon, Indeedee, Thievul, Grenninja
Shiny Pokémon are marked with sparkle icons: Zamazenta (2153), Rayquaza (2123), Staraptor (1568), Starmie (1426), Thievul (1355), and a few more
Detail screens:
Image 2: Rayquaza (CP 2651). Dragon/Flying, 213.36 kg, 7.17 m, 0/149 HP (fainted). It shows 470,695 Stardust, 21 Rayquaza Candy, 13 Candy XL and 400 Mega Energy, enough for a Mega Evolution, which needs 400.
Image 5: Shiny Rayquaza (CP 2123). Black-and-yellow shiny coloring, 134/134 HP, 289.91 kg, 8.25 m, same resources. A note says to teach it Dragon Ascent to Mega Evolve. The background is the Golden Gate Bridge.
Image 8: Hawlucha (CP 1005). Fighting/Flying, male, 17.62 kg, 0.71 m, 102/102 HP, 26 candy, moves Poison Jab and X-Scissor. The background is Chapultepec Castle in Mexico City, and the icon on the left looks like a special badge or tag.
Image 10: Pikachu (CP 385). Male, wearing a crown-like costume with a Poké Ball, 64/64 HP, Thunder Shock and Thunderbolt, 235 candy and 8 XL candy.
Image 11: Pikachu (CP 373). Female, in a purple-and-white space/astronaut outfit, 62/62 HP, Thunder Shock and Discharge.
Event filter (Image 9): Filtering by "Event" returns 64 Pokémon, including event-costume Gengar, dark Mewtwo, a party-hat Squirtle, Grimer, Raticate and Pikachu, and a flower-crowned Charizard.