Why!!!!! ??

I really needed a Nidoran to power up my Nidoking my strongest Pokémon (only 451 CP?) and it was right near my house!!! But before I could walk out the door I got the most saddest message ever "Pokémon Fled! " ? Aughhhhh!!!!!!!!!!!!!!!!! Whenever I talk to people about Pokémon go they always say their strongest Pokémon is almost 2,000!!!! Big difference 451-2,000!!!!! ADD MORE TIME FOR POKÉMON TO FLEE!!! I feel like screaming like Nidoking!

LilPokémonPuppy about Pokémon GO, v1.27.4