Rocky the Shiitake is only obtained by collecting tokens (x8) from the daily rewards calendar. Shadowblade is obtained as the 3rd daily reward. There are also tokens for him (x8) rewarded. Now and then Lupina tokens (x8) and Sifu Jianzhi tokens (x10) are available as daily reward (e.g. day 52). Rewards for players with VIP level are often multiplied by 2x or 3x, depending on the VIP level. See Daily Rewards for a list of available goodies.