Sparkplug

From MLB Power Pros Wiki

The blue/red ability, Sparkplug, can be either a bonus to a detriment to your team. The exact description is "Batting results influences the team's morale". This means if you bat well, your team's morale will increase and make them all better. The opposite, however, is also true.

Sparkplug is a blue ability in MLB Power Pros 2008.