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A crossover
an earlier event or action that is regarded as an example or guide to be considered in subsequent similar circumstances.
A wave that follows (is subsequent to - in space and/or time - is after) another (previous - primary - earlier) wave.
Pokemon exclusive to Unova cannot be traded to earlier generations. Sorry.
Yes it can come from earlier generations of the two families.
One sec... Yes, at level 65!-> (in Diamond/Pearl) Dont know about earlier generations. !
No you can't. You can only migrate Pokemon from earlier generations to later ones, and not the other way around. Sorry.
I think the developers said they are trying to get a worldwide release but it is possible for japan to get it a bit earlier.
In Haiti the people speak French [because of earlier French influence]
"This Invention" - what invention? You don't mention one.
The caste system in India dates back thousands of years, with origins traceable to ancient texts like the Rigveda. It has evolved over time to become a complex social structure that continues to influence Indian society today.
The Greek civilisation deeply influenced the Roman elite.