I'm assuming you're referring to Dragon Ball Z: The Legacy of Goku series, specifically the game Dragon Ball Z: The Legacy of Goku II doesn't have a widely known "Z Champions 3" title. However, there are a few possibilities:
One of the biggest draws of the third installment is the massive jump in playable characters. Beyond the standard Goku and Vegeta variants, players can expect deep cuts from the Super era, movie villains, and even "What If" transformations.
" represents a hypothetical or community-conceptualized next step in the series. Below is a draft for a new "Z-Link Mastery" feature designed to deepen combat mechanics and progression.
The most direct connection is to (SRW) or "Z" series by Bandai Namco.