you can take them to ethan/lyra's house in new bark town and show the pokemon to him/her and then he/she will make a wreath out of those leaves that shows when you check your pokemon's summary. another bonus is that you will get another star on your trainer card
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The trick to finding the 5 Shiny Leaves for a specific Pokémon is in the Pokémon's nature because each nature can only find its respective Shiny Leaves in specific routes such as the Pokémon with the Lonely nature can only find its Shiny Leaves in Routes 10, 16, 25, 27, 38 and 43 whereas a Pokémon with a Serious nature would be able to find its Shiny Leaves in Routes 7-8, 13-14, 33, 36 and 45.
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you can get a shiny Eevee on Pokemon leafgreen but its rare. its about a 1/5000 to get it
You can't get pikachu in Pokemon colosseum you can see it but that's all, if you want pikachu you would have to trade one from firered, leafgreen, ruby, sapphire or emerald.
In Pokemon Yellow, the only obtainable Pikachu is the one you receive from Professor Oak. You have to cheat or trade to obtain another Pikachu.
there isn't one yet
While you can catch it in Viridian Forest, you can't get it as a starter. In Pokemon Yellow, an original Gameboy game, you can get Pikachu as your starter.