This is Dialga. There is a legend that time started when Dialga was born.
After fighting Kyogre ages ago, Groudon now rest underground in a magma cavern. (That is what my Ultimate Pokemon Handbook says)
This Pokemon is Salamence. Its first form was Bagon. It always wanted to fly so it threw itself over a cliffs, luckily its skull was as hard as a rock. Then it grew wings and was able to fly.
This pokemon is Mew. It was the only pokemon that survived when all the pokemon were dying off. It cried so much that all the pokemon were revived. When someone found a fossilized Mew eyebrow, there was a clone made of Mew called MewTwo. It can learn any move it wants and can be linked to other pokemons. It protects itself with a pink bubble.