Grunge doesn't have any weapons other than a tampon (which you can't equip, because yuck). So a good way to build up your attack and defense is actually by wearing different types of armor. You can purchase these items from Wendy.  These are all the final armor pieces that you can wear in the game: 

1. Little Black Dress - Body 
   1. Adds 50 to a player’s defense 
2. Baseball Cap - Head
   1. Adds 30 to a player’s defense 
3. Stiletto Pumps - Accessory
   1. Adds 200 attack, 10 defense 
4. Ruby Mood Ring - Accessory 
   1. Adds 30 defense, 30 luck 
5. (Fake) Fur Coat - Body 
   1. Adds 30 defense 
6. Bedazzled Gloves - Accessory 
   1. Adds 20 defense, 20 agility 
7. Sports Bra - Body 
   1. Adds 50 defense 
8. Sapphire Mood ring - Accessory 
   1. Adds 100 attack and 100 defense 
9. Silver Bangle - Accessory 
   1. Adds 50 attack and 100 defense 
10. Safety Goggles - Shield  
    1. Adds 10 defense 
11. Lacy Shawl - Body 
    1. Adds 20 defense 
12. Sharktooth Necklace - Accessory 
    1. Adds 100 attack 
13. Pink Bow - Head 
    1. Adds 10 attack, 10 defense 
14. Crown - Head 
    1. Adds 30 attack, 50 defense, 10 agility 
15. Band T-shirt - Body 
    1. Adds 30 defense
16. Denim Pantsuit
    1. Adds 200 attack, 100 defense 
17. Tartan Ruffle Skirt 
    1. Adds 100 attack, 100 defense 
18. Hip Huggers & Tube Top 
    1. Adds 300 attack, 300 defense, M.Attack 30 and M.Defense 30 
19. Baggy Cargo Pants 
    1. Adds 50 attack, 100 defense 
20.  Butterfly Clip Dress
    1. Attacks 500 attack, 500 defense, M.Attack 50, M.Defense 50