not necessarily. the more famous rivalries like dialga/palkia, mew/mewtwo, etc. obviously have problems with each other. other Pokemon packs like the legendary birds, dogs, and spirits usually just leave each other alone. For all i know, Lugia and Ho-oh don't have any problems, they both guard their own turfs. The only three-way legendary clash i know of was kyogre/groudon/rayquaza.
as long as they like each other, and are opposite genders except legends
These games can fight with each other: Pokemon stadium 1 and 2 with red, blue, yellow, gold, silver and crystal. Red, blue and yellow can battle each other and gold, silver and crystal. Ruby, sapphire and emerald can battle with each other and firered, leafgreen, Pokemon colosseum and Pokemon xd gale of darkness. Diamond, Pearl and Platinum can battle each other and Heartgold and Soulsilver. The games that can battle each other can also trade with each other as well.
Yes they are cousins and they are polar opposites. And why does everyone talk about Lugia vs Ho-oh? They both love each other and would never fight one another. 2 Pokemon that hate each other are Mew and Mewtwo. If you don't believe me, check out the first Pokemon movie. Oh my god! I was wrong! I just checked out lugia legends and i figured out that lugia and ho-oh HATED each other!
yes it's about dialga,palkia and giratina they all fight each other and then they smash spear piller a aurses comes out and fight
They first went to each other and fight because of the taxes that the England people was raising. Then they went their computer and played League of Legends
africans fight each other because they belive that they should
it caused lroquois to fight each other
Yes, there is evidence the velociraptors did fight each other, sometimes to the death.
they wont fight they have to be the same BREED and LITTER to not fight each other .
they fight each other beacause they want a mate to have sex with .
a sport in which two people fight each other
They fight each other only for the colour of the team not for anything else