Here's a recommended list of out-of-shield options for the entire Super Smash Bros. Ultimate roster — frame data included
Greninja Guide: Matchup Chart and Combos | Super Smash Bros Ultimate|Game8
Greninja (SSBU)/Hitboxes - SmashWiki, the Super Smash Bros. wiki
Characters with the best frame data (based off of the average percentile of character's normals across start up frames, active frames, and endlag frames) : r/smashbros
Pokemon Ash Greninja Original Color Drawing Art Gaming - Etsy
SSBU Guide: How to Play Greninja | DashFight
Greninja (SSBU) | The episodes and movie yveltal and more. Wiki | Fandom
Amazon.com: Greninja Watercolor Print Greninja Watercolor Poster Pokemon Poster Pokemon Go Pokemon Wall Art Pokemon Gift Pokemon Greninja Art Print : Handmade Products
Greninja - Ultimate Frame Data
Greninja - Ultimate Frame Data
Greninja Guide: Matchup Chart and Combos | Super Smash Bros Ultimate|Game8
Pokémon - Ash-Greninja Wall Poster with Wooden Magnetic Frame, 22.375" x 34" - Walmart.com
Pokemon Figure Approximately 3 Inches - Greninja - Walmart.com
Data - Greninja Changes from Smash 4 | Smashboards
Ultimate Frame Data on Twitter: "Ledge Grab boxes for all characters are now available on https://t.co/aC8o3oXuRR thanks to @theEyeDonutz! They're in the "Misc" section at the bottom. Android App updating now. https://t.co/DquyFx5rba" /
Data - Greninja Changes from Smash 4 | Smashboards
Greninja Guide: Matchup Chart and Combos | Super Smash Bros Ultimate|Game8