Hello @Eldiosmario,
No, that would be you rejecting his offer and stating that his offer is lower than what you want. On that note, if you want it to be an auction please set a starting price. Otherwise this post will be treated as you selling the Pokemon or looking for offers rather than an auction ( meaning no bids, no instant buying price, no duration, etc.). I would advise looking at auctions held by other players to get a better idea of how auctions are run.
Sincerely,
Tandemaus