At this point (I mean since the 15th Pokemon movie and the Pokemon anime episode called Team Plasma's Pokemon Manipulation) he has met every legendry and so has Pikachu. Ash and Pikachu are truly lucky because they are the only ones (until the new Kalos region is introduced this fall) that have seen every Pokemon from the first five regions. Lucky pair they are.over a year ago
yeah he met: zapdos,articuno,moltres,mewtwo,mew,entei,suicune,raikou,ho-oh,lugia,celebi,regirock,registeel,regice,latias,latios,groudon,kyogre,rayquaza,jirachi,deoxys,azelf,mesprit,uxie,dialga,palkia,giratina,cresselia,darkari,manaphy,( phione as a status of a legendary pokemon ) heatran, regigigas,shaymin,ARCEUS,victini,cobalion,terrakion,virizion,keldo,tornadus,thundurus,landorus,zekrom,reshiram,kyurem,melotta,(THE NEXT MOVIE IS GENESECT AND ASH GET ATTACKED BY A SHINY GENESECT AND MEWTWO SAVED HIM)over a year ago