Yes, as awesomesocks42 mentions the type of Pokemon you put to sleep influences which area of the Dream World you will visit.
Here is a list to help you determine which type will increase your chances to visit a particular area:
Q: Does the type of Pokemon I tuck-in influence which area I go to? A: Yes, depending on
the Pokemon's type you'll visit a certain area more often than others,
here is a list of which types each area prefers (list is tentative):
Type - Area
Bug - Pleasant Forest
Dark - Spooky Manor
Dragon - No Preference
Electric - Pleasant Forest
Fire - Rugged Mountain
Fighting - Rugged Mountain
Flying - Windswept Sky
Ghost - Spooky Manor
Grass - Pleasant Forest
Ground - Icy Cave and Rugged Mountain
Ice - Icy Cave
Normal - Dream Park
Rock - Icy Cave and Rugged Mountain
Poison - Pleasant Forest
Psychic - Spooky Manor
Steel - Icy Cave and Rugged Mountain
Water - Sparkling Sea
Source: Smogon Dream World Research Thread
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tags at the same question. PS: Pokemon tag info gaming.stackexchange.com/tags/pokemon/info Your argument looks invalid to me, sorry.