Starting a HeartGold Nuzlocke. Help me decide who my required member should be!

Long story short, doing a HG nuzlocke and I'm going to have one member that I MUST catch and MUST keep on my team until I win or it dies. I have three options, and the one that gets the most votes wins!

• Dunsparce, my catch in Dark Cave
• Farfetch'd, my catch on Route 38, must name Jack
• Wobuffet, my catch from the Safari Zone (I will break up the Safari Zone separately)

Also, nickname suggestions are appreciated. Who should my redditmon be?