To find Planetchi instead of the dating channel's regular hostess is very rare. I think you may need to do it quite a few times.
P.S. another way of getting a Sunnytchi is to mate two V5 from different world regions. Example: a V5 from Australia mated to a V5 from the UK will produce a Sunnytchi (if the parents would normally create a blended family.) There are 4 regions: Japan, Oceania/Asia (such as Australia & Hong Kong), North America (meaning USA & Canada), and Europe.