Legendary pokemon are very powerful. However, only one of each can be acquired in each game. The only way to get more than one legendary pokemon in a game is to trade from a different game. This limit is also increased, as many of them are only accessible using special items or during a special event. They are the strongest pokemon of all different species. They include: the legendary birds (Articuno, Zapdos, Moltres), the mew duo (Mew, Mewtwo), the legendary beasts (Entei, Suicune, Raikou), the tower duo (Lugia, Ho-oh), the guardian of forests (Celebi), the legendary golems (Regice, Registeel, Regirock, Regigigas), the eon duo (Latias, Latios), the weather trio (Rayquaza, Kyogre, Groudon), the wish maker (Jirachi), the virus (Deoxys), the lake guardians (Mespirit, Uxie, Azelf), the legend