Hello my name is Sumo Joe and I'm a great fan of Pokemon and to help and grass deck then I'll try my best.
 
Let's take a look at Pinsir.
 
Basic Pokemon
60 HP
Irongrip- Flip a coin.  If heads the Defending Pokemon is now Paralyzed.  20 Damage. Two Grass Energy
Guillotine-50.  Two Grass, Two Colorless.
Weakness- Fire
Resistance-None
Retreat Cost-One Colorless Energy.
 
Here is a situation to have an example of a way to use this card. 
 
You have a Pinsir out with two grass energy versus a scyther fully charged up, and it is your turn.  Scyther has 70 HP you could put a Double Colorless Energy down that is in your hand and do 50 or do 20 and hope to paralyze.  Most people would do Guillotine instead BUT, if you use Irongrip and paralyze and then next turn do 50 you would kill scyther and he never hurt you.
 
The way I play Pinsir is to do just that.  If I'm fighting a 70 HP Pokemon such as Scyther then I would use Irongrip and hope to paralyze then do Guillotine to finish Scyther off.  Of course you're not always going to get heads but it is worth a try.
 
If you think of a better way to use Pinsir or other ideas let me know, also let me know what you think of my idea.
 
Contact me- Sumo Joe at Psyduck32@hotmail.com