Your egg was not an egg anymore. It was a pokemon!
Click this spoiler to find out what it is...

Spoiler:

The new pokemon emerged from its egg, and saw the world around it, with its new, still undeveloped eyes. Dennis looked at his dratini "What should we name it?" The name came to him almost instantly. Top. As it seemed to resemble one. So, onward to training his pokemon.
The first thing he wanted to do was to feed his baltoy... seeing as it has no mouth, he proceeded onto training it, by allowing it to fight another pokemon.