Mew, is the so called ANCESTOR of all pokemon, barring of course the pokemon that predate it (hi Arceus and the creation trio). This doesn't make it the strongest. Mewtwo was designed to be the strongest/ultimate fighting pokemon by genetically splicing and recombining the DNA of mew, the supposed ancestor of all pokemon.
GRIMER emerged from the sludge that settled on a polluted seabed. This POKéMON loves anything filthy. It constantly leaks a horribly germ-infested fluid from all over its body. FireRed: Sludge exposed to X rays from the moon transformed into GRIMER. It loves feeding on filthy things. LeafGreen: Appears in filthy areas.
But that "Bulk" is not to be excused--With a Calm Mind and Multiscale up, Lugia has over 1,000 Special Defense and nearly 600 Defense, so it's not going anywhere. In contrast, t +1 Lugia has 418 Sp. Attack, which offers decent offensive presence.
Minato Namikaze was a natural prodigy ever since he was little, when he became a genin Jiraya took him in as his apprentice because of the great talent he had, and later on due to Minato’s exceptional skills Jiraya believed that he might be the Child of the Prophecy someone who will save the world one day.