Here you shall find listed the changed egg groups of certain 'mon, as well as the Egg Groups of legends.
Concerning legends, there are two new Egg Groups; God and Goddess. If a legend is in the God Egg Group, it means the original was male. If a legend is in the Goddess Egg Group, then the original is female. If there is no God or Goddess in the Egg Group of a legend, than listed next to it will be either a

or

sign, indicating whether the original was male or female respectively.
Below the Egg Groups of each, you shall see; {__%

, __%

} These are the Gender Ratios of the legend for your convenience. :3 However, Gender Ratios don't REALLY effect your char; it's just a note for mods that if making a legend NPC the more likely one will be the one with the higher Gender Ratio.
Note: The Egg Groups God and Goddess are really just one; God and Goddess can breed together, God and God can breed together, and Goddess and Goddess can breed together/
Articuno ~
Flying/God
{50%

, 50%

}
Moltres ~
Flying/God
{50%

. 50%

}
Zapdos ~
Flying/God
{50%

, 50%

}
Mewtwo ~
Humanshape/Ground/God
{25%

, 75%

}
Mew ~
Fairy/Ground/Goddess
{75%

, 25%

}
Raikou ~
Ground/God
{50%

, 50%

}
Entei ~
Ground/Goddess
{50%

, 50%

}
Suicune ~
Ground/God
{50%

, 50%

}
Lugia ~
Flying/Dragon/Goddess
{75%

, 25%

}
Ho-Oh ~
Flying/God
{25%

, 75%

}
Celebi ~
Fairy/Plant/Goddess
{75%

, 25%

}
Regirock ~
Mineral {

}
{12.5%

, 87.5%

}
Regice ~
Mineral {

}
{Same as above}
Registeel ~
Mineral {

}
{Same as above}
Latias ~
Dragon/Goddess
{100%

, 0%

}
Latios ~
Dragon/God
{0%

, 100%

}
Kyogre ~
Water 1/God
Groudon ~
Monster/Humanshape/God
Rayquaza ~
Dragon/God
Deoxys ~
Indeterminate/God
Jirachi ~
Fairy/God
Uxie ~
Fairy/God
Azelf ~
Fairy/Goddess
Mesprit ~
Fairy/Goddess
Dialga ~
Dragon/God
Palkia ~
Dragon/Goddess
Giratina ~
Indeterminate/Dragon/God
Cresselia ~
Fairy/Goddess
Darkrai ~
Indeterminate/God
Manaphy ~
Water 1/Fairy {

}
Phione ~
Water 1/Fairy {

}
Regigigas ~
Mineral
Heatran ~
Indeterminate/Mineral/God
Shaymin ~
Ground/Fairy/Goddess
Arceus ~
Can breed with all {

}