The term pollination means
Opening of floral buds
The transfer of pollen grains from anther to stigma
The transfer of pollen grains from anther to the stigma of the different flower only
Formation of pollen sacs
Pollination is the transfer of pollen grains from anther to stigma.
This can be within a same flower or between 2 flowers on the same plant or between flowers present on two different plants.