DiamondSword

Hi I wanted to ask what the difference between .ek* and .pk* files are. Whenever I save a Pokémon file (ORAS as an example) it defaults to .pk6 but there's a drop-down list of file types available, and one of them is .ek6 Does this make any difference which file type I save my Pokémon as? I'm wondering if transferring the file to another save it would change things like the encryption constant, PID, memories, OT/HT data, markings etc Thank you