Aiming for Soot Black or possibly Ink blue if I land there and feel ready to give up.

Starting from Desert Yellow I fed my chocobo:
8 apples, 8 pears, 17 berries and 1 plum and ended up at Bark Brown.
From Bark Brown:
6 apples, 8 pears, 9 berries and 1 plum which took me to Rolanberry Red.
From Rolanberry Red:
2 apples, 1 pear and 5 berries brought me to Midnight Blue.
From Midnight Blue:
3 pineapples and 1 berry got me Kobold Brown.
From Kobold Brown:
1 plum.

Which has now landed me on Grape Purple. I've fed him 2 pears and 1 berry. Any input if this is the right way to Soot Black?