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Oppress is a keyword ability introduced in Wave 8. While the character with Oppress is battling, ALL characters Bold and Tough totals are reduced by the Oppress value. Unless introduced within a battle, this effect is turned on instantaneously when the character is chosen to attack or defend, and remains in play until the Post-Attack subphase begins.
The static ability of Topspin's alt mode (As well as the opposite side of Malevolent Architect) that sets their Tough equal to their Bold always applies before Oppress kicks in. Then Oppress will reduce each total by whatever the Oppress value is. So with Topspin + Clobber, Topspin will have Bold 2, and thus Tough 2 after Oppress is applied.