On the side note shaymin, victini, volcannon, hoopa, and marshadow all shiny are basically impossible or really hard to get right?
The current Pokemon that are basically impossible to get shiny at this point in time are:
- Mew*
- Victini
- Keldeo
- Meloetta
- Hoopa
- Volcanion
- Cosmog/Cosmoem/Solgaleo/Lunala
- Necrozma
- Magearna
- Marshadow
- Zeraora
*Technically, Mew can be shiny, but it's so rare that you'd have an easier time trying to win the lottery than find a legit shiny Mew.
Shaymin is obtainable as a shiny
only in Platinum via Oak's Letter special event. This Shaymin is found in the 'wild' and isn't shiny locked, so with enough patience someone could indeed get it shiny (same goes for Darkrai).
For more information, you can check out
Serebii's page on shiny Pokemon. It lists exactly which Pokemon games that Pokemon are/are not shiny locked in.
Good luck!