Crystal = any two It's pure luck whether you get a legendary type or any dragon with one element from each parent. (More likely the latter.) Using 5 gems for breeding boost helps a bit, but it is still no guarantee.

Pirate = Any Sea hybrid + any Dark.hybrid.  It is also possible you may get a Petroleum Dragon instead, or some other random dragon with one element each parent. Again, it's pure luck.

So, GOOD LUCK! =D

For Crystal,

Beware,it is a Legend,so it is hard to breed.Use any two rare hybrids.

Breeding/Combinations

For Pirate,

It is a rare hybrid, so it can be used for your Crystal.

Any two Sea and Dark Hybrids will work.

Breeding/Combinations/Dark

Breeding/Combinations/Sea

Note on rare hybrids:

Rare hybrids have oposite elements (Dark and Sea in the case of Pirate).

You can't breed them directly.  At least ONE parent needs to be a hybrid.  Both can be hybrids, but this is not necessesary and actually just adds one more element to the mix.

Some combinations are especially annoying as they can result in basic elemental dragons or other random dragons you don't need.

EX: Watefall Dragon (Terra Sea) and Hedgehog (Terra Dark).  This can yield: Pirate, Petroleum (also a dark water rare), Waterfall, Mud, Hedgehog, Venom and (sadly) basic Terra.

By contrast,  Waterfall plus Dark will be either Hedgehog, Venom, Pirate, or Petroleum.  The advantages are that it's easier to figure out what you have from breed time and all of those dragons have good income (except petroleum who is an excellent fighter) and are probably worth keeping.

I find a higher success rate getting a Rare out of two hybrids. Is that unusual?

To the best of my knowledge, it doesn't make a substantail impact on the odds (considering a lot of it is just random anyway).  I shoot for rares with 1 elemental because it's more of a controled experiment (like in science when I was younger).

"controlled experiment" <-- lol OK

I'm hammered an I have to work in 4 hours.  Why are you here?

LOL

Good thing I'm just a cook!

I'm all over the place. I take a look at anything that catches my eye. =D

Cool, a cook. What sort, might I ask? I thoroughly enjoy cooking, but I don't know if I want to work as a cook. xD

Baker actually though I've done it all, and no you don't.

Oh. I don't know how to bake anything. Except for charcoal sticks. lol  The closest I've come to baking something was bread in a bread machine. lol