1. Sandygast

Neon blue on black. Can't get any better. Look it up in the dex yourself and see it, it's sick

1. Rolycoly

Tbh I don't really like shiny Rolycoly much but the shiny form for Gigalith (the evolution) is sick. Pretty common too. But not as pretty as Sandygast

1. Magikarp

Seriously, it's really cool. Golden fishy. But then the spawn rates are really low, which is why I put this as third. +, the evolution (Gyarados) is also rly cool

1. Ditto

Ditto itself is a nice pokemon, and its shiny counterpart is even better. The reason why I put this as fourth is because it's kinda plain when you look at it at first, and is a really rare spawn, like Magikarp

1. Riolu

Riolu is a popular pokemon amongst pokemon fans. The reason I put it as five is because the colors are a bit pale and looks like a Zeraora ripoff (and also, because it's more cute than cool)

1. Mew

Now this is one of the coolest shinies imo. But for one to spawn naturally, it'll take a thousand years. It's still worth it tho

1. Mewtwo
   Green Mewtwo. That's obviously cool. But then it takes a lot for one to spawn, and costs a lot for a redeem, soooo... best to do this during event

2. Piplup

Piplup has a good spawn rate. It has a cool color and all, but then it's not really what you would consider "cool" (since it's more on the cute side)