Billy Hatcher and the Giant Egg - All Partners

Secret egg animals:
Go to level 2 in two player mode with Bantam and Chick. You will eventually see a little stump with an egg on it. Keep hatching eggs in the area and you will get the "evolution" egg animals, evolution egg hats, and even an evolution bomb which goes out on a fuse. Go to level 2 in two player mode. Go to the white egg and hatch it. A secret animal
will come out. Note: The egg may change colors, depending on the type of animal.

Secret Emblems:
In addition to the 56 mission emblems, there are 4 extra:

Emblem 58 - Complete all 56 missions
Emblem 57 - Complete Egg Gallery
Emblem 59 - Find and collect all 280 coins
Emblem 60 - Get an S Rank in every level

See all eggs:
Go to battle and eventually you will se every egg in the game, including the Sonic Team egg.

Sonic Egg:
Collect all Chick Coins in the first five missions in any world to be able to use the Sonic egg.

Sonic Team eggs:
Get the indicated number of coins to unlock a Sonic Team game character egg.

Amigo: 105 coins
Chao: 25 coins
Kapu Kapu: 35 coins
Knuckles: 205 coins
NIGHTS: 185 coins
Rappy: 65 coins
Sonic: 135 coins
Tails: 155 coins

Defeating Dark Carvo:
Dark Carvo will first make two Bosses that you have defeated in the past. Do not try to attack them; just try to dodge them. Once they disappear, you will have a chance to attack Dark Carvo. He will make duplicates of himself and try to attack you. Try to dodge him. He will lose you and stop trying to find you. This is your chance to attack him. Grab an egg and keep attacking the Dark Carvo. Once you find the real one, he will get weak and you will have another chance to attack him. Repeat these steps to defeat Dark Raven.

Defeating Dark Raven:
Once you face him, he will make two flat circles. While he does this, try to make him make the circles separated from each other by jumping repeatedly on him. Note: The circles are usually together so this would work or you could run behind him. Clean up one of his circles. To make sure you cleaned up one, sparkles will form around the circle. You will have a chance to attack him. Then, he will shoot a boomerang attack. Run toward him so that his own attack can hit him. You will now have another chance to attack him. He will shoot three or more circles. You cannot clean them. Repeat from when he shoots the boomerang attack. Once you defeat him, he will hatch the Giant Egg to change into a huge crow. Once you start to play against him, let him hit you. You will lose your suit, but this is expected. Once he shoots his dark energy ball, the chicken god will give you a Rainbow Chicken Emblem. You will get your suit back and be able to get the power to catch Dark Raven's energy balls and send them back at him. Note: It is very difficult to catch them. Press B to do so. Once you hit him, he will turn into a floating ball. You will attack him with an egg. Repeat these steps to defeat Dark Raven.

Sonic Egg:
Collect all the Chick Coins for the first 5 missions in any world

GBA Download Mini Games:
Go to the following locations and hatch the bonus egg to unlock the GBA Download Mini Game.

Puyo Pop - Blizzard Castle 3
Chu Chu Rocket - Bonus Egg In Pirate Island 2
Nights - Circus Park 2
Billy Hatcher Hyper Shoot Easy - Dino Mountain 2
Billy Hatcher Hyper Shoot Hard - Sand Ruin 2

Play as Rolly Roll, Chick Poacher, and Bantam Scrambled:

Bantam Scrambled - Beat Blizzard Castle Mission 4: Save Bantam
Chick Poacher - Beat Dino Mountain Mission 4: Save Chick
Rolly Roll - Beat Pirate Island Mission 4: Save Rolly

Secret Emblems:
In addition to the 56 mission emblems, there are 4 extra:
Emblem 58 - Complete all 56 missions
Emblem 57 - Complete Egg Gallery
Emblem 59 - Find and collect all 280 coins
Emblem 60 - Get an S Rank in every level

How to beat the first 3 bosses:
The first boss is a boss that hides in the grass so you have to run through the grass with an egg. damages get stronger the bigger the egg is Then keep repeating this and eventually you will win.

The second boss is a pirate who is made of water. You have to dodge his water bubbles until he gets in them. Then when he jumps out he will just stand there and you attack him with your egg.He shoots more bubbles every time so watch out.

The third boss is a creature on a bone dragon in the lava. You have to keep dodging the meteors until the dragon bites the edge and the guy falls off. You then have to quickly get to him and smack him around with your egg. He will do this for a while so try and stay alive.

Easy rolls:
Instead of trying to beat the egg you roll down the point you have to catch it before it roll off a cliff, roll with the egg by jumping then pressing R while rolling on the tracks.