These are the Johto Region Legendaries.
Lugia
Lugia
Much like the birds, it possesses the ability to control the weather; most notably, it can calm and give rise to storms. You can find him inside the Lugia Tower and you need to have the three legendary birds.
Stats
Health Moves/Damage
400 WingAttack(N/A),Surf(80*),AeroBlast(N/A),AncientPower(~160)
*It's a wave form so it does the same amount of damage repeatedly as long as the player is being hit by the wave.
Ho-Oh
Ho-Oh
Ho-Oh has a mythical power to resurrect the dead. Ho-Oh is the only known Pokémon to learn Sacred Fire. It is said that when it flies its huge wings create bright, colorful rainbows. You need to have all of the legendary birds.
Stats
Health Moves/Damage
400 WingAttack(N/A),FireBlast(140),SacredFire(175),AncientPower(~160)
Legendary Beasts
Brass Tower
They all share similar attributes and are considered equal among themselves.The legendary beasts also share a master in Ho-Oh. All of them can be found in the Brass Tower that spawns in the middle of the field. You'll know it is appearing because everything gets really laggy.
Raikou
Raikou
Raikou is said to represent the lightning strike which ignited the fire that consumed the Brass Tower.
Stats
Health Moves/Damage
400 ThunderShock(130),Discharge(N/A),ThunderWave(150),ThunderBolt(160)
Entei
Entei
Entei is said to represent the flames that burned the Brass Tower.
Stats
Health Moves/Damage
400 FireSpin(50),FlameThrower(50),LavaPlume(N/A),FireBlast(N/A)
Suicune
Suicune
Suicune is said to represent the rains that quenched the flames of the burning Brass Tower.
Stats
Health Moves/Damage
400 BubbleBeam(30),Aurabeam(N/A),HydroPump(250),Blizzard(N/A)